Markus, you are so right!
Here's my modus operandi on a gig with our duo:
Korg i30 (with Korg ih harmonizer) - that's it. Well, plus the required pa and amplification, of course.
My wife and I handle lead and harmony vocals (and we don't plaster everything with the ih, we just keep it simple two-part most of the time - it just gives more impact when we do use the ih).
Midifiles? Six out of a 130 song repertoire. You know, we have the ability to play the keyboard, why faff around with artificial stuff. That's a bit of a double standard, I know, given that we all play arranger keyboards which, essentially, are artifical bands, but you know what I mean.
Like yourself, we enjoy our own music tremendously, which, as you say, if that were not the case, then the audience certainly wouldn't enjoy it either - if only they'd communicate that now and again.
People not dancing - same here in Canada. You'd at least think they'd want to dance around a bit, if only to warm themselves up ;-)
Oh well, I've been playing keyboards of all variety since the 60's and we can rock with the best of 'em. So, I'm not about to throw it all in just yet, even if we do get a disproportionate number of stiffs in the audience these days.